Where does “ឯកសណ្ឋាន” come from?

ឯកសណ្ឋាន (Khmer) comes from Khmer ឯក, from Pali eka, from Sanskrit एक, from Proto-Indo-Aryan Háykas, from Proto-Indo-Iranian Háykas, from Proto-Indo-European óynos — one; single.

ឯកសណ្ឋាន (Khmer): uniform (clothing)

Definitions

uniform (clothing)

Ancestry of “ឯកសណ្ឋាន”, step by step

ឯកសណ្ឋាន traces back through two separate lines of ancestry.

via Khmer ឯក

Step	Language	Word	Meaning
1	Khmer	ឯក	one; one person
2	Pali	eka	one
3	Sanskrit	एक	one; alone, solitary, single, happening only...
4	Proto-Indo-Aryan	Háykas	one
5	Proto-Indo-Iranian	Háykas	one
6	Proto-Indo-European	óynos	one; single

via Khmer សណ្ឋាន

Step	Language	Word	Meaning
1	Khmer	សណ្ឋាន	shape, form, figure, outline, aspect, nature
2	Pali	saṇṭhāna	—

Every word from Proto-Indo-European óynos →Every word from Proto-Indo-Iranian Háykas →Every word from Proto-Indo-Aryan Háykas →